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Analog Devices Inc. LTC3899MPUHF#PBF
- Part No.:
- LTC3899MPUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3899MPUHF#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BUCK-BST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,947
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Product details
Overview
LTC3899MPUHF#PBF from Analog Devices (formerly Linear Technology) is a high-performance triple-output synchronous buck/buck/boost DC/DC controller driving all-N-channel MOSFET stages. It operates from 4.5V–60V input, delivers regulated outputs up to 60V, supports phase-lockable switching up to 850kHz, and achieves 29μA no-load quiescent current-enabling cold-crank operation down to 2.2V in automotive start-stop systems.
For engineers reviewing the LTC3899MPUHF#PBF datasheet, LTC3899MPUHF#PBF pinout, LTC3899MPUHF#PBF application, or LTC3899MPUHF#PBF equivalent, key selection criteria include its triple-output topology, –55°C to 150°C extended temperature rating, programmable gate drive (5V–10V), OPTI-LOOP® compensation, and 38-lead 5mm × 7mm QFN package with exposed thermal pad.
Technical Context
The LTC3899MPUHF#PBF implements constant-frequency current-mode control across three independent channels: two synchronous buck controllers (Channels 1 & 2) and one synchronous boost controller (Channel 3). Each channel features dedicated ITH error amplifier inputs, SENSE+/- current-sense inputs, and VFB feedback pins with distinct reference voltages (0.8V for bucks, 1.2V for boost).
Its architecture integrates internal top-gate bootstrap switches eliminating external diodes, supports programmable DRVCC (5V–10V) via DRVSET, enables output voltage tracking/soft-start via TRACK/SS pins, and provides flexible frequency control through FREQ resistor programming or PLLIN synchronization-ensuring precise timing coordination in multi-rail power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V continuous; supports cold-crank down to 2.2V after startup via auxiliary bias |
| Output Topology | Triple output: two synchronous buck + one synchronous boost, all N-channel MOSFET driven |
| Switching Frequency | Programmable 50kHz–900kHz; phase-lockable 75kHz–850kHz via PLLIN/MODE pin |
| Quiescent Current | 29μA in Sleep Mode (one channel active); 3.6μA in full shutdown |
| Feedback Reference | 0.8V ±1% for buck channels; 1.2V ±1% for boost channel (VPRG3 = float) |
| Operating Temp Range | –55°C to 150°C junction (MP grade), qualified for automotive and industrial harsh environments |
| Gate Drive Voltage | Programmable 5V–10V via DRVSET pin; eliminates need for external level-shifting circuitry |
| Package | 38-lead 5mm × 7mm QFN (UHF) with exposed GND pad for thermal management |
Pinout & Package
38-lead plastic QFN (UHF) package, 5mm × 7mm body, 0.5mm pitch, exposed thermal pad (Pin 39 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; INTVCC/GND selects fixed high/low frequency |
| PLLIN/MODE (Pin 2) | Sync input / light-load mode select | External clock syncs TG1 edge; voltage level selects Burst Mode, pulse-skipping, or forced CCM |
| INTVCC (Pin 8) | Internal 5V LDO output | Powers analog/digital core circuits; requires 0.1µF ceramic bypass close to pin |
| RUN1/RUN2/RUN3 (Pins 9,10,11) | Independent channel enable | ≥1.275V enables; <1.22V disables channel; all <0.7V enters full shutdown |
| DRVSET (Pin 16) | DRVCC regulation control | Defines DRVCC voltage (5V–10V) and sets UVLO/switchover thresholds for DRVCC/EXTVCC |
| DRVCC (Pin 22) | Gate driver supply output | Supplies TG/BG drivers; must be decoupled with ≥4.7µF low-ESR capacitor |
| VBIAS (Pin 24) | Main bias supply input | Primary power source for internal LDOs; bypass with capacitor to GND |
| TG1/TG2/TG3 (Pins 32,18,27) | Top-gate drivers | Floating drivers with DRVCC swing referenced to SWx; no external bootstrap diodes needed |
| BG1/BG2/BG3 (Pins 29,21,25) | Bottom-gate drivers | GND-referenced drivers; complementary to TGx with controlled dead-time delays |
| BOOST1/BOOST2/BOOST3 (Pins 30,20,26) | Bootstrap supplies | Charge pump outputs for floating top-gate drive; BOOST3 swings to VOUT3 + DRVCC |
| SW1/SW2/SW3 (Pins 31,19,28) | Switch node connections | Connects to inductor center taps; critical for current sensing and EMI layout |
| VPRG3 (Pin 34) | Boost output mode select | Float = adjustable (via VFB3); GND = 10V fixed; INTVCC = 12V fixed |
| TRACK/SS1/SS2/SS3 (Pins 33,17,3) | Tracking & soft-start inputs | Enable output voltage ramping and sequencing; internal 10µA pull-up for RC timing |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide range of output capacitance and ESR without external compensation components |
| 100% Duty Cycle Boost Operation | Allows VOUT3 to track VIN when VIN > VOUT3 setpoint-ideal for battery backup and seamless switchover |
| No External Bootstrap Diodes | Integrated high-side switch in top-gate drivers eliminates discrete diodes, reducing BOM count and layout area |
| Low Dropout Buck Operation | 99% max duty cycle enables ultra-low dropout regulation-critical for high-VIN, low-VOUT applications |
| Triple Independent RUN Pins | Per-channel enable/disable allows dynamic rail sequencing, power gating, and fault isolation in multi-output systems |
| Wide Input Range Cold-Crank Support | Operates from 2.2V input after startup using boost output or auxiliary supply-meets ISO 16750-2 automotive requirements |
Applications
| Automotive Start-Stop Systems | Distributed Power Architectures |
|---|---|
Use Scenario: Power management in vehicles with engine stop/start functionality where battery voltage dips to 2.2V during cranking. IC Role / Device Role / Timing Role: Triple-output controller generating stable 5V, 8.5V, and 10V rails from a single 12V battery input with cold-crank resilience. Use Value: Maintains microcontroller, sensor, and infotainment subsystems powered during cranking without brownout or reset. | Use Scenario: Board-level power delivery in telecom base stations requiring isolated, sequenced, and efficient multi-rail conversion. IC Role / Device Role / Timing Role: Centralized synchronous controller managing buck (core logic), buck (I/O), and boost (interface bias) rails with synchronized switching. Use Value: Reduces EMI through phase-locking, improves efficiency via N-channel MOSFET optimization, and simplifies thermal design with single-package integration. |
| Industrial Battery-Powered Equipment | High-Reliability Embedded Systems |
Use Scenario: Portable test equipment operating from Li-ion packs (8–26V) needing long runtime and stable analog/digital rails. IC Role / Device Role / Timing Role: Low-IQ triple controller delivering 3.3V, 5V, and 12V outputs while maintaining 29μA sleep current per active channel. Use Value: Extends operational time between charges by minimizing quiescent loss without sacrificing transient response. | Use Scenario: Avionics or defense electronics requiring extended temperature operation and radiation-tolerant design margins. IC Role / Device Role / Timing Role: MP-grade controller providing –55°C to 150°C operation with robust current-mode control and redundant enable logic. Use Value: Ensures uninterrupted power delivery under extreme thermal stress and mechanical shock conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3899HUHF#PBF | Same architecture and pinout; rated for –40°C to 150°C (H grade) instead of –55°C to 150°C (MP grade) | Lacks extended low-temperature qualification; unsuitable for cryogenic or space-grade deployments | Select if operating ambient stays above –40°C and cost sensitivity outweighs extended temp margin |
| LTC3899IUHF#PBF | Same architecture and pinout; rated for –40°C to 125°C (I grade); lower max junction temperature | Not qualified for under-hood automotive or high-ambient industrial use; reduced thermal headroom | Choose only for commercial-grade applications with controlled thermal environments and budget constraints |
Compared with LTC3899HUHF#PBF and LTC3899IUHF#PBF, the LTC3899MPUHF#PBF uniquely supports –55°C operation-enabling deployment in aerospace, deep-well instrumentation, and polar-environment systems where other grades fail to meet startup or regulation specs.
Availability
LTC3899MPUHF#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, distributed power architectures, and high-reliability embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3899MPUHF#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3899 product line was designed specifically for demanding multi-rail DC/DC conversion in automotive, industrial, and aerospace applications-emphasizing wide input range, ultra-low IQ, and robust synchronous control across buck and boost topologies.
FAQ
What is the minimum input voltage required for startup of the LTC3899MPUHF#PBF?
The LTC3899MPUHF#PBF requires a minimum 5V on VBIAS to initiate startup. Once running, it can sustain operation down to 2.2V input by biasing from the boost output or an auxiliary supply-enabling cold-crank resilience in automotive applications. This behavior is confirmed in the datasheet's "DESCRIPTION" section and typical application schematic.
How does the LTC3899MPUHF#PBF achieve 100% duty cycle in boost mode?
The LTC3899MPUHF#PBF achieves 100% duty cycle in boost mode by internally disabling the bottom-gate driver (BG3) while maintaining top-gate (TG3) conduction, allowing the output to directly follow the input voltage when VIN exceeds the programmed VOUT3. This is explicitly specified in the Electrical Characteristics table under "DFMAX(BG)" for Channel 3.
Can the LTC3899MPUHF#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3899MPUHF#PBF supports external synchronization via the PLLIN/MODE pin. When an external clock is applied, the phase-locked loop aligns the rising edge of TG1 to the external clock's rising edge. The supported synchronizable frequency range is 75kHz to 850kHz, as documented in the Electrical Characteristics table under "fSYNC".
What is the purpose of the VPRG3 pin on the LTC3899MPUHF#PBF, and how does it affect boost output configuration?
The VPRG3 pin on the LTC3899MPUHF#PBF selects the boost channel's output mode: floating configures adjustable output (regulated via VFB3 to 1.2V), GND sets fixed 10V output, and INTVCC sets fixed 12V output. This is verified in the "PIN FUNCTIONS" section (Page 12) and Electrical Characteristics table (VFB3 values per VPRG3 state).
Does the LTC3899MPUHF#PBF require external bootstrap diodes for high-side gate drive?
No, the LTC3899MPUHF#PBF integrates internal switches in the top-gate drivers that eliminate the need for external bootstrap diodes. This is stated in the "FEATURES" list ("No External Bootstrap Diodes Required") and confirmed in the "PIN FUNCTIONS" description for BOOST1/2/3 pins, which specify internal charge-pump switching.
LTC3899MPUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Number of Outputs:
- 3
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 60V
- Frequency - Switching:
- 105kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start, Tracking
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3899MPUHF#PBF FAQ
1.How can I place an order for LTC3899MPUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899MPUHF#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3899MPUHF#PBF reliable?
The price and inventory of LTC3899MPUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899MPUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3899MPUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899MPUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899MPUHF#PBF?
LTC3899MPUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899MPUHF#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3899MPUHF#PBF?
For technical support, including LTC3899MPUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899MPUHF#PBF requirements.
6.How does Aetrix verify that LTC3899MPUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3899MPUHF#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3899MPUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3899MPUHF#PBF?
All LTC3899MPUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899MPUHF#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3899MPUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3899MPUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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